In the first house, enter the grandfather clock in the dining room by pressing A. While in the clock, press B, C, C, B. Press A again to exit the clock. You'll now have 15,000 points and be in the second house. In the second house, enter the toilet in the Jacuzzi Room and press C, C, C, B. You'll get 15,000 points and be in the third house. In the third house, enter the garbage can in the garage. Press B, C, B, B and exit the garage. You'll be in the final house and get 45,000 points!